Thank you very much for your feedback! So yeah, the game is quite difficult because it's inspired a little (or a lot) by touhou project in terms of projectiles to dodge but as a platformer game.
Then you don't have to kill them, you can just move forward by dodging, it will be like playing in peaceful mode lol
The run button is used to run (obviously) and to jump higher, it's true that while playing we press it all the time, I would consider reversing the function of the button. And no, I didn't take my inspiration from cave story (at least not officially) but I've already played it!
Actually the idea that the game takes place in a cave comes from the fact that I wanted to add gold ores for the "Ore" theme.